HWC shared a story with me in facebook comments about a time she and Dennis were just talking, and suddenly he started spouting rage and vitriol and sneering at her.

If only all three of our stories were enough to convince the people who are defending him/telling me I'm causing "drama" that Dennis is a fucking problem and needs to be ostracized. But no, that's Geek Social Fallacy #1, and you can't ostracize anyone. I am extremely disappointed in one of our mutual friends right now.